A single-phase white light emitting phosphor BaY(PO):Ce/Tb/Mn: luminescence, energy transfer and thermal stability.

A series of Ce/Tb, Tb/Mn and Ce/Tb/Mn doped BaY(PO) were synthesized by the high temperature solid state method. Phase formation, energy transfer, luminescence properties and thermal quenching properties of phosphors were analyzed in detail. For the co-doped samples, the energy transfer from Ce to Tb and Tb to Mn was proved by analyzing the spectra and fluorescence lifetime, and the energy transfer mechanism was calculated to be dipole-dipole interaction. A series of color-tunable phosphors were obtained by the energy transfer from Ce to Tb and Tb to Mn. For the tri-doped samples, it was confirmed that the energy transfers from Ce to Tb, Tb to Mn and Ce to Mn exist at the same time by analyzing the spectra properties, and it can emit warm-white light with extensive color temperature regulability. In addition, the thermal stability was abnormal and outstanding because the defects exist in the samples. The results show that the phosphors may be novel warm white emitting phosphors for white light emitting diodes.